Measurement ±640 mV
Measurement mode | ±640 mV | |
---|---|---|
Measuring range, nominal | -640…+640 mV | |
Measuring range, end value (FSV) | 640 mV | |
Measuring range, technically usable | -687.2…+687.2 mV | |
PDO resolution (including sign) | 24 bit | 16 bit 2) |
PDO LSB (Extended Range) | 81.92 nV | 20.97152 µV |
PDO LSB (Legacy Range) | 76.29.. nV | 19.53.. µV |
Input impedance ±Input 1 (internal resistance) | Differential typ. 4.12 MΩ || 11 nF CommonMode typ. 40 nF against SGND |
2) The analog measurement is always done with 24 bits, in 16-bit mode the eight least significant bits are cut off. For further information see chapter “Commissioning”/ “Process data overview”
Specific data
Measurement mode |
±640 mV |
Data preliminary = X | |||
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Basic accuracy: Measuring deviation at 23°C, with averaging 3) |
< ±0.005 %, < ±50 ppmFSV typ. < ±32.0 µV typ. |
| |||
Extended basic accuracy: Measuring deviation at 0…55°C, with averaging 3) 6) |
< ±0.0095 %, < ±95 ppmFSV typ. < ±60.8 µV typ. |
| |||
Offset/Zero point deviation (at 23°C) 3) |
EOffset |
< 20 ppmFSV |
| ||
Gain/scale/amplification deviation (at 23°C) 3) |
EGain |
< 40 ppm |
| ||
Non-linearity over the whole measuring range 3) |
ELin |
< 25 ppmFSV |
| ||
Repeatability, over 24 h, with averaging 3) |
ERep |
< 5.0 ppmFSV |
| ||
Temperature coefficient 3) |
TcGain |
< 2 ppm/K typ. |
| ||
TcOffset |
< 1.5 ppmFSV/K typ. < 0.96 µV/K typ. |
| |||
Noise (without filtering) |
ENoise, PtP |
< 70 ppm FSV |
< 547 digits |
< 44.80 µV |
|
ENoise, RMS |
< 12 ppm FSV |
< 94 digits |
< 7.68 µV |
| |
Max. SNR |
> 98.4 dB |
| |||
Noisedensity@1kHz |
< 0.11 |
| |||
Noise (with 50 Hz FIR filter) |
ENoise, PtP |
< 12 ppm FSV |
< 94 digits |
< 7.68 µV |
|
ENoise, RMS |
< 2.0 ppm FSV |
< 16 digits |
< 1.28 µV |
| |
Max. SNR |
> 114.0 dB |
| |||
Common-mode rejection ratio (without filter) |
DC: >115 dB typ. |
50 Hz: >105 dB typ. |
1 kHz: >80 dB typ. |
X | |
Common-mode rejection ratio (with 50 Hz FIR filter) |
DC: >115 dB typ. |
50 Hz: >115 dB typ. |
1 kHz: >115 dB typ. |
X | |
Largest short-term deviation during a specified electrical interference test |
±0.03% = 300 ppm FSV typ. |
X |
3) Valid for ELM3702-00x0 and ELM3704-00x0 from HW01; Valid for ELM3704-10x1 from HW01 except 20 mA, 0‑5 V and 0‑10 V measuring ranges. Specifications of predecessor-HW on request.
6) Calculated value according to equation in chapter "General information on measuring accuracy/measurement uncertainty" for quick estimation of usability over the specified ambient temperature range in operation (Tambient). In real use, for example at a relatively constant ambient temperature Tambient, a lower (better) achievable uncertainty is attained. A specific calculation according to chapter "General information on measuring accuracy/measurement uncertainty" is recommended, especially if the instrument allows a wider ambient temperature range in operation than 0...55 °C.

Note: In Extended Range Mode the Underrange/Overrange display in the PDO status has the character of an information/warning when the nominal measuring range is exceeded, i.e. no Error is displayed in the PDO status and LED. If the technical measuring range is also exceeded, Error = TRUE is also displayed. The detection limit for Underrange/Overrange Error can be set in the CoE. In Legacy Range mode, an Underrange/Overrange event also leads to an Error in the PDO status. |